FAQ – OBDI and OBDII P72 Ecu Pinouts

FAQ – OBDI and OBDII P72 Ecu Pinouts

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The P72 ecu is a very common and widely used unit for either chipped applications, or similar piggyback systems to control the electronic fuel injection in many late model Hondas and Acuras. It’s one of the more integral parts of a Honda motor swap, and like many other Honda parts is interchangeable to other vehicles that share a B16, B17, or B18 motor set.

As part of an emerging category of Pro Street FAQ, we’re compiling ECU and PCM pinouts for the many popular sport compact and muscle cars out there and here’s the P72 in OBDI and OBDII flavors.

OBDI P72 ECU Pinouts.

A1 BRN INJ1 INJ1
A2 YEL INJ4 INJ4
A3 RED INJ2 INJ2
A4 GRN/YEL VTS VTEC solenoid
A5 BLU INJ3 INJ3
A6 ORN/BLK PO2SHTC O2 sensor (heating element)
A7 GRN/BLU FLR1 fuel pump
A8 (empty)
A9 BLK/BLU IACV IAC valve
A10 (empty)
A11 (empty)
A12 GRN FANC engine coolant temp switch
A13 GRN/ORN MIL MIL (check engine light)
A14 (empty)
A15 BLK/RED ACC (a/c compressor clutch)
A16 WHT/GRN ALT C alternator
A17 PNK/BLU IAB IAB Solenoid
A18 (empty)
A19 YEL (AUTO ONLY) (a/t trans only)
A20 RED PCS EVAP purge control solenoid
A21 YEL/GRN ICM ICM
A22 (empty)
A23 BLK PG1 ground
A24 BLK PG2 ground
A25 YEL/BLK IGP2 to main relay and to gound for o
A26 BRN/BLK LG1 gound
B1 YEL/BLK IGP2 to pin A25
B2 BRN/BLK LG2 ground to shields for CYP & TDC
B3 (a/t trans only)
B4 (a/t trans only)
B5 BLU/RED ACS a/c switch
B6 (empty)
B7 (a/t trans only)
B8 GRN PSPSW PSP switch
B9 BLU/WHT STARTER SIGNAL starter signal
B10 ORN VSS vehicle speed sensor
B11 ORN CYP P CYP -P
B12 WHT CYP M CYP -M
B13 ORN/BLU TDC P TDC -P
B14 WHT/BLU TDC M TDC -M
B15 BLU/GRN CKP P CKP -P
B16 BLU/YEL CKP M CKP -M
D1 WHT/BLU VBU Back Up Power
D2 GRN/WHT BKSW brake switch
D3 KS Knock Sensor
D4 BRN/WHT SCS service check connector
D5 (empty)
D6 BLU/BLK VTM VTEC pressure switch
D7 LT BLU TXD/RXD (data link connector)
D8 (empty)
D9 WHT/RED ALT F alternator
D10 GRN/RED ELD electric load detector
D11 RED/BLK TPS TPS Signal
D12 YEL/GRN
D13 RED/WHT ECT ECT sensor
D14 WHT/RED PHO2S O2 sensor
D15 RED/YEL IAT IAT sensor
D16 WHT/BLK VREF VREF
D17 WHT/YEL MAP Map Signal
D18 (a/t trans only)
D19 YEL/WHT VCC1 MAP 5V
D20 YEL/BLU VCC2 TPS 5V
D21 GRN/WHT SG1 MAP GND
D22 GRN/BLU SG2 TPS GND

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OBDII ECU PINOUTS

Pin Number OBD-2 P72 ECU
A1 #4 Injector
A2 #3 Injector
A3 #2 Injector
A4 #1 Injector
A5 Second O2 Sensor Heat Control
A6 Primary O2 Sensor Heat Control
A7
A8 VTEC Spool Solenoid Valve
A9 Logic Ground (LG1)
A10 Power Ground (PG1)
A11 Power Source (IGP1)
A12 Idle Air Control Valve (IACV)
A13
A14
A15 Evap. Purge Control Solenoid Valve (PCS)
A16 Fuel Pump Relay (FLR)
A17 A/C Clutch Relay
A18 Check Engine Light (MIL)
A19 Alternator Control (ALTC)
A20 Ignition Control Module (ICM)
A21
A22 Logic Ground (LG2)
A23 Power Ground (PG2)
A24 Power Source (IGP2)
A25 Reference Voltage (VREF)
A26 Intake Air Bypass Control Solenoid Valve (IAB)
A27 Radiator Fan Control (FANC)
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
C1 CKF Sensor (CKF-P)
C2 CKP Sensor (CKP-P)
C3 TDC Sensor (TDC-P)
C4 CYP Sensor (CYP-P)
C5 A/C Switch (ACS)
C6 Starter Switch Signal (STS)
C7 Service Check & Ignition Timing Connector (SCS)
C8 K-Line
C9 Feedback At Signal (FAS)
C10 Voltage Back Up (VBU)
C11 CKF Sensor (CKF-M)
C12 CKP Sensor (CKP-M)
C13 TDC Sensor (TDC-M)
C14 CYP Sensor (CYP-M)
C15 VTEC Pressure Switch (VTM)
C16 P/S Oil Pressure Switch
C17 Alternator FR Signal (ALTF)
C18 Vehicle Speed Sensor (VSS)
C19
C20
C21 Barometric Sensor Output Signal
D1 Throttle Postion Sensor (TPS)
D2 Engine Coolant Temp. Sensor (ECT)
D3 MAP Sensor
D4 Sensor Voltage (VCC1)
D5 Brake Switch
D6 Knock Sensor
D7 Primary O2 Sensor
D8 Intake Air Temp. Sensor
D9
D10 Sensor Voltage (VCC2)
D11 Sensor Ground (SG2)
D12 Sensor Ground (SG1)
D13 Secondary Heated O2 Sensor Ground
D14 Secondary Heated O2 Sensor
D15 Electric Load Detector (ELD)

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Happy Tuning!

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